Making blueberry buttercream frosting is a straightforward process that anyone can master. Follow these steps to achieve a perfect consistency and flavor:

1. Prepare the Blueberry Puree:
   • Rinse the blueberries thoroughly under cold water and drain.
   • In a small saucepan, cook the blueberries over medium heat until they release their juices and soften, about 5-7 minutes.
   • Use a blender or food processor to puree the cooked blueberries until smooth, then strain through a fine-mesh sieve to remove any solids.
   • Set the blueberry puree aside to cool completely.
2. Cream the Butter:
   • In a large mixing bowl, beat the softened butter with an electric mixer on medium speed until creamy and smooth, about 2 minutes.
3. Add the Sugar and Flavorings:
   • Gradually add the powdered sugar, one cup at a time, beating on low speed until fully incorporated.
   • Once all the sugar is added, increase the speed to medium and beat for another 1-2 minutes.
   • Add the vanilla extract, lemon juice, and a pinch of salt, and mix until combined.
4. Incorporate the Blueberry Puree:
   • Slowly add the cooled blueberry puree to the buttercream mixture, beating on medium speed until fully blended and the frosting is a consistent color throughout.
   • Adjust the consistency if needed by adding more powdered sugar for a thicker frosting or a bit of milk for a thinner texture.
5. Final Touches:
   • Once the frosting reaches the desired consistency, give it a final stir to ensure everything is well-mixed.
   • Your blueberry buttercream is now ready to use!